mirror of
https://github.com/DrBeef/ioq3quest.git
synced 2024-11-30 15:51:53 +00:00
215 lines
9.7 KiB
C
215 lines
9.7 KiB
C
/***********************************************************************
|
|
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
- Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions and the following disclaimer.
|
|
- Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
- Neither the name of Internet Society, IETF or IETF Trust, nor the
|
|
names of specific contributors, may be used to endorse or promote
|
|
products derived from this software without specific prior written
|
|
permission.
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS”
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
***********************************************************************/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
/*
|
|
* Matrix of resampling methods used:
|
|
* Fs_out (kHz)
|
|
* 8 12 16 24 48
|
|
*
|
|
* 8 C UF U UF UF
|
|
* 12 AF C UF U UF
|
|
* Fs_in (kHz) 16 D AF C UF UF
|
|
* 24 AF D AF C U
|
|
* 48 AF AF AF D C
|
|
*
|
|
* C -> Copy (no resampling)
|
|
* D -> Allpass-based 2x downsampling
|
|
* U -> Allpass-based 2x upsampling
|
|
* UF -> Allpass-based 2x upsampling followed by FIR interpolation
|
|
* AF -> AR2 filter followed by FIR interpolation
|
|
*/
|
|
|
|
#include "resampler_private.h"
|
|
|
|
/* Tables with delay compensation values to equalize total delay for different modes */
|
|
static const opus_int8 delay_matrix_enc[ 5 ][ 3 ] = {
|
|
/* in \ out 8 12 16 */
|
|
/* 8 */ { 6, 0, 3 },
|
|
/* 12 */ { 0, 7, 3 },
|
|
/* 16 */ { 0, 1, 10 },
|
|
/* 24 */ { 0, 2, 6 },
|
|
/* 48 */ { 18, 10, 12 }
|
|
};
|
|
|
|
static const opus_int8 delay_matrix_dec[ 3 ][ 5 ] = {
|
|
/* in \ out 8 12 16 24 48 */
|
|
/* 8 */ { 4, 0, 2, 0, 0 },
|
|
/* 12 */ { 0, 9, 4, 7, 4 },
|
|
/* 16 */ { 0, 3, 12, 7, 7 }
|
|
};
|
|
|
|
/* Simple way to make [8000, 12000, 16000, 24000, 48000] to [0, 1, 2, 3, 4] */
|
|
#define rateID(R) ( ( ( ((R)>>12) - ((R)>16000) ) >> ((R)>24000) ) - 1 )
|
|
|
|
#define USE_silk_resampler_copy (0)
|
|
#define USE_silk_resampler_private_up2_HQ_wrapper (1)
|
|
#define USE_silk_resampler_private_IIR_FIR (2)
|
|
#define USE_silk_resampler_private_down_FIR (3)
|
|
|
|
/* Initialize/reset the resampler state for a given pair of input/output sampling rates */
|
|
opus_int silk_resampler_init(
|
|
silk_resampler_state_struct *S, /* I/O Resampler state */
|
|
opus_int32 Fs_Hz_in, /* I Input sampling rate (Hz) */
|
|
opus_int32 Fs_Hz_out, /* I Output sampling rate (Hz) */
|
|
opus_int forEnc /* I If 1: encoder; if 0: decoder */
|
|
)
|
|
{
|
|
opus_int up2x;
|
|
|
|
/* Clear state */
|
|
silk_memset( S, 0, sizeof( silk_resampler_state_struct ) );
|
|
|
|
/* Input checking */
|
|
if( forEnc ) {
|
|
if( ( Fs_Hz_in != 8000 && Fs_Hz_in != 12000 && Fs_Hz_in != 16000 && Fs_Hz_in != 24000 && Fs_Hz_in != 48000 ) ||
|
|
( Fs_Hz_out != 8000 && Fs_Hz_out != 12000 && Fs_Hz_out != 16000 ) ) {
|
|
silk_assert( 0 );
|
|
return -1;
|
|
}
|
|
S->inputDelay = delay_matrix_enc[ rateID( Fs_Hz_in ) ][ rateID( Fs_Hz_out ) ];
|
|
} else {
|
|
if( ( Fs_Hz_in != 8000 && Fs_Hz_in != 12000 && Fs_Hz_in != 16000 ) ||
|
|
( Fs_Hz_out != 8000 && Fs_Hz_out != 12000 && Fs_Hz_out != 16000 && Fs_Hz_out != 24000 && Fs_Hz_out != 48000 ) ) {
|
|
silk_assert( 0 );
|
|
return -1;
|
|
}
|
|
S->inputDelay = delay_matrix_dec[ rateID( Fs_Hz_in ) ][ rateID( Fs_Hz_out ) ];
|
|
}
|
|
|
|
S->Fs_in_kHz = silk_DIV32_16( Fs_Hz_in, 1000 );
|
|
S->Fs_out_kHz = silk_DIV32_16( Fs_Hz_out, 1000 );
|
|
|
|
/* Number of samples processed per batch */
|
|
S->batchSize = S->Fs_in_kHz * RESAMPLER_MAX_BATCH_SIZE_MS;
|
|
|
|
/* Find resampler with the right sampling ratio */
|
|
up2x = 0;
|
|
if( Fs_Hz_out > Fs_Hz_in ) {
|
|
/* Upsample */
|
|
if( Fs_Hz_out == silk_MUL( Fs_Hz_in, 2 ) ) { /* Fs_out : Fs_in = 2 : 1 */
|
|
/* Special case: directly use 2x upsampler */
|
|
S->resampler_function = USE_silk_resampler_private_up2_HQ_wrapper;
|
|
} else {
|
|
/* Default resampler */
|
|
S->resampler_function = USE_silk_resampler_private_IIR_FIR;
|
|
up2x = 1;
|
|
}
|
|
} else if ( Fs_Hz_out < Fs_Hz_in ) {
|
|
/* Downsample */
|
|
S->resampler_function = USE_silk_resampler_private_down_FIR;
|
|
if( silk_MUL( Fs_Hz_out, 4 ) == silk_MUL( Fs_Hz_in, 3 ) ) { /* Fs_out : Fs_in = 3 : 4 */
|
|
S->FIR_Fracs = 3;
|
|
S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR0;
|
|
S->Coefs = silk_Resampler_3_4_COEFS;
|
|
} else if( silk_MUL( Fs_Hz_out, 3 ) == silk_MUL( Fs_Hz_in, 2 ) ) { /* Fs_out : Fs_in = 2 : 3 */
|
|
S->FIR_Fracs = 2;
|
|
S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR0;
|
|
S->Coefs = silk_Resampler_2_3_COEFS;
|
|
} else if( silk_MUL( Fs_Hz_out, 2 ) == Fs_Hz_in ) { /* Fs_out : Fs_in = 1 : 2 */
|
|
S->FIR_Fracs = 1;
|
|
S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR1;
|
|
S->Coefs = silk_Resampler_1_2_COEFS;
|
|
} else if( silk_MUL( Fs_Hz_out, 3 ) == Fs_Hz_in ) { /* Fs_out : Fs_in = 1 : 3 */
|
|
S->FIR_Fracs = 1;
|
|
S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR2;
|
|
S->Coefs = silk_Resampler_1_3_COEFS;
|
|
} else if( silk_MUL( Fs_Hz_out, 4 ) == Fs_Hz_in ) { /* Fs_out : Fs_in = 1 : 4 */
|
|
S->FIR_Fracs = 1;
|
|
S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR2;
|
|
S->Coefs = silk_Resampler_1_4_COEFS;
|
|
} else if( silk_MUL( Fs_Hz_out, 6 ) == Fs_Hz_in ) { /* Fs_out : Fs_in = 1 : 6 */
|
|
S->FIR_Fracs = 1;
|
|
S->FIR_Order = RESAMPLER_DOWN_ORDER_FIR2;
|
|
S->Coefs = silk_Resampler_1_6_COEFS;
|
|
} else {
|
|
/* None available */
|
|
silk_assert( 0 );
|
|
return -1;
|
|
}
|
|
} else {
|
|
/* Input and output sampling rates are equal: copy */
|
|
S->resampler_function = USE_silk_resampler_copy;
|
|
}
|
|
|
|
/* Ratio of input/output samples */
|
|
S->invRatio_Q16 = silk_LSHIFT32( silk_DIV32( silk_LSHIFT32( Fs_Hz_in, 14 + up2x ), Fs_Hz_out ), 2 );
|
|
/* Make sure the ratio is rounded up */
|
|
while( silk_SMULWW( S->invRatio_Q16, Fs_Hz_out ) < silk_LSHIFT32( Fs_Hz_in, up2x ) ) {
|
|
S->invRatio_Q16++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Resampler: convert from one sampling rate to another */
|
|
/* Input and output sampling rate are at most 48000 Hz */
|
|
opus_int silk_resampler(
|
|
silk_resampler_state_struct *S, /* I/O Resampler state */
|
|
opus_int16 out[], /* O Output signal */
|
|
const opus_int16 in[], /* I Input signal */
|
|
opus_int32 inLen /* I Number of input samples */
|
|
)
|
|
{
|
|
opus_int nSamples;
|
|
|
|
/* Need at least 1 ms of input data */
|
|
silk_assert( inLen >= S->Fs_in_kHz );
|
|
/* Delay can't exceed the 1 ms of buffering */
|
|
silk_assert( S->inputDelay <= S->Fs_in_kHz );
|
|
|
|
nSamples = S->Fs_in_kHz - S->inputDelay;
|
|
|
|
/* Copy to delay buffer */
|
|
silk_memcpy( &S->delayBuf[ S->inputDelay ], in, nSamples * sizeof( opus_int16 ) );
|
|
|
|
switch( S->resampler_function ) {
|
|
case USE_silk_resampler_private_up2_HQ_wrapper:
|
|
silk_resampler_private_up2_HQ_wrapper( S, out, S->delayBuf, S->Fs_in_kHz );
|
|
silk_resampler_private_up2_HQ_wrapper( S, &out[ S->Fs_out_kHz ], &in[ nSamples ], inLen - S->Fs_in_kHz );
|
|
break;
|
|
case USE_silk_resampler_private_IIR_FIR:
|
|
silk_resampler_private_IIR_FIR( S, out, S->delayBuf, S->Fs_in_kHz );
|
|
silk_resampler_private_IIR_FIR( S, &out[ S->Fs_out_kHz ], &in[ nSamples ], inLen - S->Fs_in_kHz );
|
|
break;
|
|
case USE_silk_resampler_private_down_FIR:
|
|
silk_resampler_private_down_FIR( S, out, S->delayBuf, S->Fs_in_kHz );
|
|
silk_resampler_private_down_FIR( S, &out[ S->Fs_out_kHz ], &in[ nSamples ], inLen - S->Fs_in_kHz );
|
|
break;
|
|
default:
|
|
silk_memcpy( out, S->delayBuf, S->Fs_in_kHz * sizeof( opus_int16 ) );
|
|
silk_memcpy( &out[ S->Fs_out_kHz ], &in[ nSamples ], ( inLen - S->Fs_in_kHz ) * sizeof( opus_int16 ) );
|
|
}
|
|
|
|
/* Copy to delay buffer */
|
|
silk_memcpy( S->delayBuf, &in[ inLen - S->inputDelay ], S->inputDelay * sizeof( opus_int16 ) );
|
|
|
|
return 0;
|
|
}
|